Medium temperature solid fuel cell glass packaging material

Abstract

A medium temperature solid oxide fuel cell glass packaging material is provided. The glass packaging material may include a glass main body made of SiO 2 , Al 2 O 3 , Y 2 O 3 and ZnO, and at least one glass modifier added into the glass main body. Glass transition temperature ranges from 700 to 900 degrees Celsius. The glass modifier may be rare earth elements or transitory elements. The added glass modifier may adjust the glass transition temperature and the thermal expansion coefficient, and improve the bonding characteristics of the glass packaging material, so as to allow the manufactured glass packaging material to be applicable in SOFC application temperature range from 500 to 800 degrees Celsius.

What is claimed is: 
     
       1. A medium temperature solid oxide fuel cell glass packaging material without the addition of lead, boron, and alkaline earth elements, consisting of:
 a glass main body made of SiO 2 , Al 2 O 3 , Y 2 O 3  and ZnO; and 
 at least one glass modifier added into the glass main body for manufacturing the glass packaging material, the at least one glass modifier is selected from the group consisting of La 2 O 3 , Nd 2 O 3 , and NiO; 
 wherein a glass transition temperature ranges from 700 to 900 degrees Celsius; 
 SiO 2 , Al 2 O 3 , Y 2 O 3  and ZnO are obtained from oxides, metal hydroxides, carbonates, sulfates or nitrates; 
 Y 2 O 3  is for adjusting an expansion coefficient of the glass main body, and accounts for 6.0 to 24.0 mol % of the glass packaging material; 
 ZnO is for adjusting the glass transition temperature, a softening point and a glass crystallization temperature of the glass main body while accounting for 10.0 to 25.0 mol % of the glass packaging material; 
 and 
 the combined amount of SiO 2  and Al 2 O 3  account for 45.0 to 65.0 mol % of the glass packaging material. 
 
     
     
       2. The glass packaging material according to  claim 1 , wherein the glass modifier is La 2 O 3  for adjusting a thermal expansion coefficient of the glass packaging material and La 2 O 3  accounts for 4.0 to 18.0 mol % of the glass packaging material. 
     
     
       3. The glass packaging material according to  claim 2 , where La 2 O 3  is obtained from oxides, metal hydroxides, carbonates, sulfates or nitrates. 
     
     
       4. The glass packaging material according to  claim 1 , wherein the glass modifier is Nd 2 O 3  for adjusting a thermal expansion coefficient of the glass packaging materials and Nd 2 O 3  accounts for 4.0 to 18.0 mol % of the glass packaging material. 
     
     
       5. The glass packaging material according to  claim 4 , wherein Nd 2 O 3  is obtained from oxides, metal hydroxides, carbonates, sulfates or nitrates. 
     
     
       6. The glass packaging material according to  claim 1 , wherein the glass modifier is NiO for adjusting the glass transition temperature and bonding characteristics of the glass packaging material, and NiO accounts for 4.0 to 18.0 mol % of the glass packaging material. 
     
     
       7. The glass packaging material according to  claim 6 , wherein NiO is obtained from oxides, metal hydroxides, carbonates, sulfates or nitrates.